ZXLD1366EN8TC Diodes Inc, ZXLD1366EN8TC Datasheet - Page 27

• Manufacturer Part Number: ZXLD1366EN8TC
• Description: Current & Power Monitors & Regulators LED DRVR W/ INT SW 1A 60V
• Manufacturer: Diodes Inc

Specifications of ZXLD1366EN8TC

• Product: Current Monitors
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Sense Voltage (max): 0.3 V
• Supply Voltage (max): 60 V
• Supply Voltage (min): 6 V
• Package / Case: SO-8-EP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application Information
High voltage tracks
Avoid running any high voltage tracks close to the ADJ pin, to reduce the risk of leakage currents due to board contamination.
The ADJ pin is soft-clamped for voltages above 1.35V to desensitize it to leakage that might raise the ADJ pin voltage and
cause excessive output current. However, a ground ring placed around the ADJ pin is recommended to minimize changes in
output current under these conditions.
Evaluation PCB
ZXLD1366 evaluation boards are available on request. Terminals allow users to interface the boards to their preferred LED
products.
Dimming output current using PWM
Low frequency PWM mode
When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage V
zero, the output of the internal low pass filter will swing between 0V and V
below its turn-off threshold (200mV nom) when the ADJ pin is low. This will cause the output current to be switched on and off
at the PWM frequency, resulting in an average output current I
(See Figure 9 - Low frequency PWM operating waveforms).
The average value of output current in this mode is given by:
I
This mode is preferable if optimum LED 'whiteness' is required. It will also provide the widest possible dimming range
(approx. 1000:1) and higher efficiency at the expense of greater output ripple.
ZXLD1366
Document number: DS31992 Rev. 6 - 2
OUTavg
3.3k
GND
Output Current
PWM Voltage
0.2D
PWM
100nF
/R
S
IOUTnom
[for D
V
0V
0
ADJ
PWM
ADJ
Figure 9. Low frequency PWM operating waveforms
(Continued)
>0.001]
ZXLD1366
GND
Ton
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27 of 30
OUTavg
proportional to the PWM duty cycle.
Toff
ADJ
, causing the input to the shutdown circuit to fall
Diodes Incorporated
A Product Line of
ADJ
and a low level of
© Diodes Incorporated
0.2/Rs
IOUTavg
ZXLD1366
March 2011